## Origin of Nasopharyngeal Angiofibroma **Key Point:** Nasopharyngeal angiofibroma (NAF) arises from the **lateral wall of the nasopharynx near the sphenopalatine foramen** (also called pterygopalatine fossa region). ### Anatomical Basis - The tumor originates from a **vascular pedicle** supplied by branches of the **maxillary artery** (terminal branch of external carotid artery) - The sphenopalatine foramen is the communication between the pterygopalatine fossa and nasopharynx - This location explains why NAF is highly **vascular and prone to epistaxis** ### Clinical Significance - The tumor typically grows **anteriorly and medially** into the nasal cavity and nasopharynx - Can extend posteriorly into the sphenoid sinus and skull base - The vascular pedicle origin is crucial for **preoperative embolization** planning **High-Yield:** The lateral nasopharyngeal origin near the sphenopalatine foramen is a pathognomonic feature that distinguishes NAF from other nasopharyngeal masses. **Clinical Pearl:** Understanding the origin from the pterygopalatine fossa explains why **angiography and embolization** are standard preoperative procedures — the tumor's blood supply must be identified and controlled before surgical excision. 
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